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Product comparison · 2 internal hard drives

Acer 120GB 2.5" 5400rpm Seagate Merrcury2 ST9120821A (RohS) (option) vs Samsung 500GB HDD

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  • 15specifications compared
  • 14differ
  • 1identical
  • 18known for one product only

Key differences

The Samsung 500GB HDD has 380 GB more HDD capacity than the Acer 120GB 2.5" 5400rpm Seagate Merrcury2 ST9120821A (RohS) (option) (500 GB vs 120 GB). The Samsung 500GB HDD has 1,800 RPM more HDD speed than the Acer 120GB 2.5" 5400rpm Seagate Merrcury2 ST9120821A (RohS) (option) (7200 RPM vs 5400 RPM). The Samsung 500GB HDD has 1" more HDD size than the Acer 120GB 2.5" 5400rpm Seagate Merrcury2 ST9120821A (RohS) (option) (3.5" vs 2.5"). Interface: Ultra-ATA/100 on the Acer 120GB 2.5" 5400rpm Seagate Merrcury2 ST9120821A (RohS) (option), Serial ATA II on the Samsung 500GB HDD. Operating voltage: 5 V on the Acer 120GB 2.5" 5400rpm Seagate Merrcury2 ST9120821A (RohS) (option), 5 / 12 V on the Samsung 500GB HDD.

  • HDD capacity
    • 120 GB
    • 500 GB
  • HDD speed
    • 5400 RPM
    • 7200 RPM
  • HDD size
    • 2.5"
    • 3.5"
  • Interface
    • Ultra-ATA/100
    • Serial ATA II
  • Storage drive buffer size
    • 8 MB
    • 16 MB
  • Average seek time
    • 12.5 ms
    • 8.9 ms
  • Average latency
    • 5.6 ms
    • 4.17 ms
  • Operating voltage
    • 5 V
    • 5 / 12 V

Side by side

Differences highlightedShow differences only
33 specifications
A

Acer

120GB 2.5" 5400rpm Seagate Merrcury2 ST9120821A (RohS) (option)View product
B

Samsung

500GB HDDView product
Features7 differ
HDD capacityDiffers120 GB500 GB
HDD speedDiffers5400 RPM7200 RPM
HDD sizeDiffers2.5"3.5"
InterfaceDiffersUltra-ATA/100Serial ATA II
TypeKnown for oneHDD
Storage drive buffer sizeDiffers8 MB16 MB
Full stroke seek timeKnown for one18 ms
Track to track seek timeKnown for one0.8 ms
Average seek timeDiffers12.5 ms8.9 ms
Average latencyDiffers5.6 ms4.17 ms
SMART technologyKnown for oneYes
Bytes per sectorKnown for one512
Start/stop cyclesKnown for one50000
Mean time between failures (MTBF)Known for one600000 h
Power1 differ
Power consumption (typical)Known for one8 W
Power consumption (standby)Known for one1.2 W
Operating voltageDiffers5 V5 / 12 V
Operational conditions2 differ
Operating temperature (T-T)Differs5 - 55 °C0 - 60 °C
Storage temperature (T-T)-40 - 70 °C-40 - 70 °C
Operating relative humidity (H-H)Known for one5 - 90%
Storage relative humidity (H-H)Known for one5 - 95%
Operating altitudeKnown for one0 - 3000 m
Non-operating altitudeKnown for one0 - 12000 m
Operating shockDiffers250 G63 G
Non-operating shockKnown for one300 G
Weight & dimensions4 differ
WidthDiffers70 mm101.6 mm
DepthDiffers100 mm146.1 mm
HeightDiffers9.5 mm25.4 mm
WeightDiffers100 g640 g
Other featuresidentical
Drive ready timeKnown for one10 s
Acoustic pressure emissionsKnown for one2.4 dB
Dimensions (WxDxH)Known for one70 x 100 x 9.5 mm
InternalKnown for oneYes

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